Ah, good ol' Turbo music. I'll help out where I can.
Black Hole Assault
EXCELLENT soundtrack in my opinion. One of my favorite redbook soundtracks ever, in fact. It's the exact same as the Sega CD version, if you ever heard it. High quality synths for its day. Upbeat, pumping rock. Great music for a mecha fighting game.
Dynastic Hero
Like the others mentioned, this game has a pretty decent soundtrack. DH was actually a licensed remake of Wonderboy III for Genesis, but the soundtrack is totally different. The synth quality is rather good, but it's not one of my favorite Turbo soundtracks overall.
Double Dragon II
A HUGE let down. Oh my god. This game could have done wonders with the original DDII score on redbook, had it stuck to it, that is. Instead the music is totally different and extremely average in my opinion. The game blew too. Go for the Mega Drive version if anything.
Kaze Kiri
Pretty good soundtrack in my view. The synth quality is a bit aged, but has this nostalgic, pleasing quality to it. It's very old school. The music is upbeat, ninja action "zundara" style. Definitely check this one out if you like old school action music.
Kisou Louga
Fairly solid. The style of music is synth orchestra in a vein similar to Shining Force, with lots of upbeat, march themes. The orchestration and harmony is a bit more colorful than Shining Force CD (for example), but I still prefer Shining's melodic style a bit better.
Neo Nectaris
One of my favorite Turbo soundtracks. No live instruments, but the orchestrated synth quality is pretty damn good for it's day. Lots of bold, war-themed melodies. Definitely check this one out.
Startling Odyssey II
For what few redbook tracks this game has (most of the game's BGM is PSG), the music is OK. There's a mix of both rock and orchestrated styles, and even a vocal if I remember correctly. Just wish there were more tracks. Not worth pursuing for music alone probably.
Xak III
Standard action-RPG fare with no tracks that really stand out. Pretty generic redbook quality synths too. Don't bother with this one, even though the game itself actually isn't half bad.
As for other recommendations, aside from the obvious (Dracula X, Ys, Lords of Thunder, Langrisser, Dungeon Explorer II, etc. etc.), here are a few others that come to mind.
Efera & Jiliora The Emblem of Darkness
A pretty boring RPG/shooter game based on the old anime with a sleeper hit of a soundtrack. Synth-rock quality that's pleasing to the ear, and reminds me a lot of Dungeon Explorer II's music.
Tenshi No Uta I, II
You probably already know about these and that they were composed by Michiko Naruke, but in case you didn't, now you do. Definitely not up to snuff with her Wild Arms scores, but pretty decent nonetheless. Style is well...RPGish light orchestra I'd say.
Lemmings
Yes, there was a PCE Engine CD version of this game too. Whether or not you like the Lemmings soundtrack is up to you, but this game had some of the best versions of the Lemmings themes out there. Totally destroys the other redbook version floating around, which was taken from the PSX release I think. Has a nice Japanese synthy spin to it.
Fiend Hunter
An awesome game that got no love. Don't be fooled if you ever heard the terrible vocal arrange album that was released. The in-game music is actually pretty good. Half of it was PSG, but the battle music was all redbook, and is generally upbeat rock, with a few funky and orchestral themes thrown in here and there. If nothing else, get this one to play the game WHILE listening to the music.
That's it off the top of my head for now. Happy hunting.
- Justin Pfeiffer